Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Instrumentation und Anwendungen I

HK 37.7: Talk

Thursday, March 13, 2008, 18:15–18:30, 2C

Latest Results and New Developments From the FRS Ion-Catcher Project at GSI — •Martin Petrick for the FRS Ion-Catcher collaboration — JLU, Gießen

A key element of the Low-Energy-Branch (LEB) of the FAIR-facility will be the energy buncher and the stopping cell for in-flight separated exotic nuclei. This device will provide high quality beams of short-lived nuclei for high precision experiments such as decay spectroscopy, direct mass measurements and laser-spectroscopy. In an on-line experiment with a beam of 280 MeV/u, projectiles were produced by fragmentation of a ⁵⁸Ni-beam in an aluminium target, stopped in a helium-filled gas cell and extracted with a few eV through an RF-quadrupole ion distribution system, which guided the ions to a silicon surface barrier detector and a time-of-flight mass spectrometer. In the experiment the efficiency of the setup, molecule -and adduct-formation in the gas and extraction times from the gas cell were investigated. As a proof-of-principle the half-life of ⁵⁴Co was determined.
As a second generation stopping cell, a cryogenic device is under development for the LEB. Its benefit is the smaller dimension in longitudional beam direction due to larger gas density. According to the use of cryogenic gas compared with ion catchers driven at room temperature, the diffusion losses decrease and a higher efficiency is therefor expected. In this presentation an overview on the experiment, its results and the new developements will be given.